SP3490CN-L RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The SP3490CN-L is a 1/1 full-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This interface IC is designed for industrial and commercial serial communication applications requiring robust noise immunity and reliable data transmission over twisted-pair cabling.

The SP3490CN-L is discontinued at DiGi Electronics. Equivalent and substitute parts are available from active manufacturers including Analog Devices Inc., Texas Instruments, and Renesas Electronics Corporation. These alternatives maintain functional compatibility while offering extended operating temperature ranges, improved data rates, or enhanced receiver hysteresis specifications.

Key Parameters

Parameter	SP3490CN-L
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	25 mV
Data Rate	10 Mbps
Voltage - Supply	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SP3490CN-L is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB layout compatibility without redesign.
Protocol Support: All substitutes must support both RS422 and RS485 protocols for full functional equivalence.
Driver/Receiver Configuration: 1/1 full-duplex transceiver topology is mandatory.
Supply Voltage Range: The original part operates at 3V ~ 3.6V. Substitutes with overlapping or extended voltage ranges are acceptable; however, substitutes with non-overlapping ranges (e.g., 4.75V ~ 5.25V or 4.5V ~ 5.5V) require circuit design verification.
Data Rate: The original part supports 10 Mbps. Substitutes with equal or higher data rates are acceptable.
Operating Temperature: The original part operates at 0°C ~ 70°C. Substitutes with extended temperature ranges (e.g., -40°C ~ 85°C) are acceptable and provide enhanced reliability in wider environmental conditions.
Receiver Hysteresis: The original part specifies 25 mV. Substitutes with higher hysteresis values (30 mV, 50 mV, 70 mV) provide improved noise immunity but may affect threshold sensitivity.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis (mV)	Data Rate (Mbps)	Supply Voltage	Operating Temperature	Package	Product Status
SP3490CN-L	MaxLinear, Inc.	RS422, RS485	1/1	Full	25	10	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	Discontinued
ADM1490EBRZ	Analog Devices Inc.	RS422, RS485	1/1	Full	30	16	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active
ADM1490EBRZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Full	30	16	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active
ADM3490ARZ	Analog Devices Inc.	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
ADM3490ARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
ADM3490EARZ	Analog Devices Inc.	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
ADM3490EARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
DS8921M/NOPB	Texas Instruments	RS422, RS485	1/1	Full	70	—	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active
DS8921MX/NOPB	Texas Instruments	RS422, RS485	1/1	Full	70	—	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active
ISL83490IBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
ISL83490IBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Full	50	10	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Voltage-Compatible Substitutes (3V ~ 3.6V Supply)

The ADM3490 series (ADM3490ARZ, ADM3490ARZ-REEL7, ADM3490EARZ, ADM3490EARZ-REEL7) and ISL83490 series (ISL83490IBZ, ISL83490IBZ-T) maintain the original 3V ~ 3.6V supply voltage range, eliminating the need for power supply circuit modifications. These parts are direct pin-compatible replacements with identical 8-SOIC packaging. All are ROHS3 compliant and carry REACH Unaffected status. The ADM3490 and ISL83490 variants feature 50 mV receiver hysteresis compared to the original 25 mV, providing enhanced noise immunity in electrically noisy environments. Extended operating temperature ranges (-40°C ~ 85°C) improve reliability across wider environmental conditions.

Higher Data Rate Substitute (5V Supply)

The ADM1490EBRZ and ADM1490EBRZ-REEL7 support 16 Mbps data rates, exceeding the original 10 Mbps specification. These parts require a 4.75V ~ 5.25V supply voltage, necessitating circuit design verification to confirm power supply compatibility. Extended operating temperature range (-40°C ~ 85°C) and ROHS3 compliance are provided. Use this substitute only when higher data rate capability is required and 5V supply is available.

Alternative Temperature-Matched Substitute (5V Supply)

The DS8921M/NOPB and DS8921MX/NOPB from Texas Instruments maintain the original 0°C ~ 70°C operating temperature range but require 4.5V ~ 5.5V supply voltage. These parts feature 70 mV receiver hysteresis for maximum noise immunity. Data rate specification is not provided. Use this substitute when operating temperature range matching is critical and 5V supply is available.

Packaging Variants

Tube packaging (standard) and Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® packaging variants are available for most substitutes. Selection depends on procurement and assembly requirements. Functional specifications remain identical across packaging variants for the same base part number.

Frequently Asked Questions (FAQ)

Q: Can I use ADM1490EBRZ as a direct replacement for SP3490CN-L?

A: ADM1490EBRZ is functionally compatible but requires circuit design verification. The original part operates at 3V ~ 3.6V; ADM1490EBRZ requires 4.75V ~ 5.25V. If your circuit uses 3V ~ 3.6V power supply, this substitute is not suitable without power supply redesign. The ADM3490 series maintains the original voltage range and is a more direct replacement.

Q: What is the difference between ADM3490ARZ and ADM3490EARZ?

A: Both parts share identical electrical specifications: 50 mV receiver hysteresis, 10 Mbps data rate, 3V ~ 3.6V supply voltage, and -40°C ~ 85°C operating temperature. The difference is packaging: ADM3490ARZ is supplied in Tube packaging, while ADM3490EARZ is also supplied in Tube packaging. The -REEL7 variants (ADM3490ARZ-REEL7, ADM3490EARZ-REEL7) are supplied in Cut Tape (CT) & Digi-Reel® format for automated assembly. Select based on your procurement and assembly process requirements.

Q: Why do some substitutes have higher receiver hysteresis than the original part?

A: Receiver hysteresis determines the voltage difference between the rising and falling threshold levels. Higher hysteresis (50 mV or 70 mV versus 25 mV) provides improved noise immunity in electrically noisy industrial environments by reducing susceptibility to signal reflections and crosstalk. This is a beneficial characteristic for RS422/RS485 applications. Lower hysteresis may be more sensitive to noise but allows detection of smaller signal transitions.

Q: Are all substitute parts RoHS compliant?

A: Yes. The original SP3490CN-L is RoHS Compliant. All active substitute parts listed are ROHS3 Compliant, meeting current RoHS 3 (2015/863/EU) requirements. All substitutes carry REACH Unaffected status where specified.

Q: Can I use ISL83490IBZ-T instead of ISL83490IBZ?

A: Both parts are electrically identical with the same specifications. ISL83490IBZ is supplied in Tube packaging; ISL83490IBZ-T is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on your assembly process. Note that ISL83490IBZ-T carries Moisture Sensitivity Level (MSL) 3 (168 Hours), requiring controlled storage conditions, while the original SP3490CN-L specifies MSL 1 (Unlimited).

Q: What is the impact of different operating temperature ranges?

A: The original SP3490CN-L operates at 0°C ~ 70°C. Most active substitutes extend this to -40°C ~ 85°C, providing operation in wider environmental conditions including cold industrial environments and high-temperature applications. If your application operates within the original 0°C ~ 70°C range, both the original and extended-range substitutes are suitable. Extended-range parts provide additional design margin for future applications.

Q: Is the 8-SOIC package identical across all parts?

A: Yes. All parts listed use the 8-SOIC (0.154", 3.90mm Width) surface mount package. Pin assignments and PCB footprints are identical, enabling direct board-level substitution without layout modifications.

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